A Florida man pleaded guilty on Monday to charges that he conspired to operate an illegal bitcoin exchange, one prosecutors say was owned by an Israeli who oversaw a computer hacking scheme that led to an attack on JPMorgan Chase & Co.

Anthony Murgio, 33, entered his plea in federal court in Manhattan to three counts, including conspiracy to operate an unlicensed money transmitting business and conspiracy to commit bank fraud, a month before he was set to face trial.